Hi.. Welcome to HEALTHCARE MAGIC.. I have gone through your query and can understand your concerns.. As per your complain the symptoms of fever, sore throat, headache and post nasal drainage seems to be due to viral infection that can be most probably Influenza or Flu or Infectious Mononucleosis or Mono.. I would suggest you to consult an Infectious medicine specialist and get evaluated and a thorough clinical evaluation, throat swab culture to check for viral infection, and blood tests can help in diagnosis and treatment can be done accordingly.. As viral infection is resolved once the virus completes its cycle in human body, therefore you can be advised supportive treatment to relieve the symptoms.. You can be advised to take a combination of Acetaminophen [Fever reducer] and Ibuprofen[anti inflammatory painkiller]. You can also be advised to do cool sponges on forehead and extremities.. You should do warm saline gargles, steam inhalation and use a humidifier in your room.. You can suck throat lozenges and chew a Vitamin C pellet daily.. You can sip on plenty of warm water.. Avoid spicy and chilled food.. Take a soft bland diet and sufficient rest.. Hope this information helps.. Thanks and regards. Dr.Honey Nandwani Arora.